Meet the Magene H303 Heart Rate Sensor—your reliable companion for precise, data-driven training. Built for athletes who want real-time feedback and consistent results, the H303 blends Bluetooth 4.2 and ANT+ compatibility with a feather-light chest strap, so you can train with confidence across apps, bike computers, and fitness devices. With a 1000-hour battery life on a single CR2032 and hospital-grade precision (±1 BPM), this monitor stays with you from warm-ups to the final sprint.

Why the Magene H303 Elevates your training

Designed for precision and reliability, the H303 delivers heart-rate data that matters in the moment and for long-term progress. With a competitive accuracy of ±1 BPM and a broad 30–240 BPM range, it covers everything from easy endurance rides to intense intervals. The sensor uses both Bluetooth 4.2 and ANT+ to ensure fast, stable connections with your gym app, smartwatch, or bike computer—so you don’t miss a beat as your workout changes pace.

Compact, light, and built to last

• Weight: 16 g for the monitor and 30 g for the chest strap, so you forget you’re wearing it during runs or cycles.
• Dimensions: 62.3 x 35.1 x 11.5 mm for a discreet profile under gym shirts or jersey vests.
• Water resistance: IP67-rated, ready for sweaty sessions, rain-soaked rides, and daily training without worry.
• Battery life: up to 1000 hours on a single CR2032 battery, with one pre-installed in the monitor for immediate use.

What’s in the box

• 1 × Magene H303 Heart Rate Monitor
• 1 × CR2032 battery (pre-installed in the monitor)
• 1 × Adjustable elastic chest strap (64–86 cm, ±2 cm)

Care and maintenance for the chest strap

To keep readings accurate and the strap comfortable, rinse the strap under running water after each workout and hang to dry. Do not machine wash or machine dry, as harsh cycles can degrade the fabric and the fit over time.

Who is this ideal for?

Whether you’re a runner chasing precise pace zones, a cyclist refining power-to-heart-rate correlations, or a gym enthusiast layering cardio intervals into HIIT sessions, the Magene H303 gives you clear, actionable data. It’s also great for athletes who train with multiple devices and apps, ensuring you have a consistent monitoring option regardless of the platform.

Key use cases and benefits

• Real-time heart-rate display during workouts to optimize intensity and recovery.
• Accurate zones tracking (e.g., warm-up, fat burn, cardio, peak) to structure sessions for better fitness gains.
• Cross-device compatibility means seamless pairing with fitness apps, watches, and bike computers that support Bluetooth or ANT+.
• Long-term training consistency thanks to stable battery life and reliable sensor readings.

How Magene H303 stands out

Unlike generic monitors, the H303 balances ultra-light construction with dual wireless formats, delivering precise HR data without dragging on your workout. The strap length is adaptable to most torso sizes, while the pre-installed battery and simple care routine keep setup quick and hassle-free. The combination of high-precision HR (±1 BPM) and broad measurement range lets you experiment confidently with more sophisticated training strategies.

Take control of every workout with the Magene H303—the compact heart-rate monitor that stays with you from start to finish, reliable across devices, and built to outlast the most rigorous training weeks.